As someone who hasn’t checked a bag in more than five years of travel across the U.S. and abroad, I’ve thought a lot about what makes a good piece of carry-on luggage. A summertime European ...

so your carry-on bag doesn’t smell." It’s the first rule of traveling with a baby: Bring more diapers than you think you will need. "Plan for delays, missed flights, and mid-air poopsplosions ...